I have been playing around with the iPad Brushes application. It's now a free open source app. Basically, you can draw/paint on the iPad and mimic various brushes, textures, etc. The app can also record your brushstrokes which is both pretty cool and creepy. But it's a great way to create a time-lapse video of the painting process. I mirrored the iPad animation onto my laptop using Airplay and then used AirServer to record it and export out as a video file. Then post to my Youtube channel. Hopefully, future functionality will have video export built in to the application.
Here's the final image:
